Uplink power control in dual connectivity to first or second cell group based on first or second configuration

Abstract

A disclosure of the present specification provides a power control method. The method may comprise a step of receiving an upper layer signal by a user equipment (UE) in which dual connectivity between a first cell and a second cell is configured. Here, the upper layer signal may comprise configuration information to be used for the dual connectivity. The configuration information may comprise one of a first configuration and a second configuration. The user equipment (UE) in which the dual connectivity is configured can be connected to a first cell group including the first cell and a second cell group including the second cell, respectively. Here, each cell group may belong to an individual base station (eNodeB). The method may comprise a step of performing power control with regard to an uplink transmission to one or more of the first cell and the second cell, on the basis of one of the first configuration and the second configuration.

What is claimed is: 
     
       1. A method for performing a power control, the method performed by a user equipment (UE) and comprising:
 allocating, by the UE configured with dual connectivity, a power for an uplink transmission to a first cell group including a first cell; 
 allocating a power for an uplink transmission to a second cell group including a second cell, 
 wherein each cell group belongs to a respective eNodeB; and 
 performing a power control for at least one of the allocated power of the first cell group and the second cell group, 
 wherein the power control corresponds to a scaling down, and 
 wherein the scaling down of the power is performed for at least one of a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) including a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/negative-acknowledgement (NACK) signal or a scheduling request (SR). 
 
     
     
       2. The method of  claim 1 , wherein the power control is varied based on whether a sounding reference signal (SRS) is to be transmitted or not. 
     
     
       3. The method of  claim 1 , wherein the power control is varied based on a case where the first cell group corresponds to a master cell group (MCG) and the second cell group belongs corresponds to a secondary cell group (SCG) or where the first cell group corresponds to the SCG and the second cell group corresponds to the MCG. 
     
     
       4. The method of  claim 1 , further comprising:
 receiving, by the UE configured with dual connectivity, a higher layer signal including configuration information to be used for the dual connectivity, 
 wherein the configuration information includes one of a first configuration and a second configuration. 
 
     
     
       5. The method of  claim 1 , wherein the power is allocated based on a priority which specifies a sequential order of a physical random access channel (PRACH), PUCCH and PUSCH. 
     
     
       6. A user equipment (UE) for performing a power control, the UE comprising:
 a reception unit configured with a dual connectivity; and 
 a processor configured to:
 allocate a power for an uplink transmission to a first cell group including a first cell, 
 allocate a power for an uplink transmission to a second cell group including a second cell, 
 wherein each cell group belongs to a respective eNodeB, and 
 perform the power control for at least one of the allocated power of the first cell group and the second cell group, 
 
 wherein the power control corresponds to a scaling down, and 
 wherein the scaling down of the power is performed for at least one of a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) including a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/negative-acknowledgement (NACK) signal or a scheduling request (SR). 
 
     
     
       7. The UE of  claim 6 , wherein the power control is varied based on whether a sounding reference signal (SRS) is to be transmitted or not. 
     
     
       8. The UE of  claim 6 , wherein the power control is varied based on a case where the first cell group corresponds to a master cell group (MCG) and the second cell group belongs corresponds to a secondary cell group (SCG) or where the first cell group corresponds to the SCG and the second cell group corresponds to the MCG.